Mixing With Impulse Responses

Fine Tune Your Audio Knowledge

This article is part of Fred-E-Scene’s continued focus on technology education. This week’s article is about Impulse Responses by audio engineer Jake Duffie of Jake Duffie Audio and The Underground Alliance. Find out more below:

I’m Jake Duffie, from Jake Duffie Audio, and I’ve been doing this audio thing  seriously for about three years now. Though I am still quite fresh to the profession, I’ve spent my whole life toying with the software as a hobby, and spent a year at Recording Arts Canada to get a solid baseline knowledge of recording standards, and techniques.

Now that I’ve introduced myself, I’m going to talk a bit about Impulse Responses. An impulse response, or “IR” is a short audio file (about 0.5-2 seconds) that captures the audio effect of a room, reverb, cab/mic simulation, or any number of audio modifying clips, meant to have a primary sound being pushed through it.

As soon as I learned how to use an IR, it replaced nearly half of my plugins. One of the biggest boons to these files over algorithmic FX VSTs, is the tiny amount of CPU power it takes to run them by comparison. That being said, this means that the effect is static, and hits the audio the same way, at all times. This can be an advantage for consistency, but you can lose a little musicality in the process.

The first time I had founding myself needing to use an IR, it was to simulate a mic/cab after a free guitar amp VST. While the use of IRs for a cab sims has it’s disadvantages, it got me to look into all the other uses of simple wav files loaded in as an effect.

The biggest advantage I have found so far, is the ability to utilize the many captured IRs that are widely available around the web of expensive vintage gear. The Lexicon 480L IRs find a place on every session I’ve worked on since obtaining them.

Loading IRs

There are a variety of VSTs that are capable of loading IRs, but I’ll be using ReaVerb for this example. Download links can be found at the bottom. I would also recommend NadIR, for low latency tracking with amp sims.

Though I will be using REAPER, this steps will work in nearly every other Daw. ReaVerb can be downloaded within the free ReaPlugs suite by Cockos, if you are not using REAPER yourself. You will also need a file to use as the IR, so I’ll use one of the files from the Lexicon 480L unit, which can also be found at the bottom of this article.

We will be adding reverb to a track, so add the ReaVerb FX to the track that could use a little more space and sustain. If you are loading an amp sim, you would want the wet knob all the way up and the dry completely off, but with this being a reverb, you will want the dry at unity (0.0dB), and wet at about (-30.0dB) to start. Press the “Add” button, within the VST gui. choose the “File” option, and you will be brought to the Windows Explorer/Mac Finder to find your audio file. I will choose the Silver Plate

At this point, your work is roughly complete. You have your audio file playing at full volume, with a version of the same audio being run through the IR of your choice at (-30.0bB). Set the wet to taste, and that’s it!

Original Link: https://jakeduffieaudio.com/2017/05/27/mixing-with-irs/


REAPER Download
ReaPlugs Download
Lexicon 480L IRs Download

Article By









Jake Duffie from Jake Duffie Audio/The Underground Alliance



Currently operating in Fredericton/Woodstock NB, I am an audio engineer for hire. I work closely with The Underground Alliance to promote our East Coast music scene, and make our mark as a culturally booming corner of the world.

I’ve studied audio production at Recording Arts Canada in Toronto, where I started to shift my personal hobby into a career. In my time back in my hometown of Fredericton, I’ve had the opportunity to record a variety of phenomenal and driven musicians.

JDA Website: Jake Duffie Audio

JDA Facebook: https://www.facebook.com/JakeDuffieRecording/










The Underground Alliance’s main focus is to help bring more bands and shows to this beautiful province of New Brunswick. We will work with all types of genres. You need a show? No problem, we can help with that. You need help booking a tour? We’ll help with that too. You need help recording and releasing demo/single? We do that too. We want to help bands get that extra spark in the music scene.

NOTE: We’ve moved off to Woodstock now, but we will still be doing a lot of work in Fredericton!

UA Website: https://undergroundalliancemusic.com/

UA Facebook: https://www.facebook.com/UndergroundAllianceMusic/

UA Email: daniel.monteith355@hotmail.com




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